Packing-gasket.



No. 659,047. Patented FebQzs, lam. A. B. PRATT.

PACKING GASKET. (Appuceionmea oct. a; 1900.)

(No Model.)

Fig ,2.

. 'Vga Vllll/l//llll/lIl/I'lill/[IILvll/111111lllll/lllllll/nvl- Inventor @115km m., an www azz;

m: Num.: Pz'rsas co. wom-uwe.. WASHINGTON. n. c.

lltirrnn Sterns Partnr Ormes.

ALBERT B. PRATT, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE GAR- I LOCK PACKING COMPANY, OF PALMYRA, NEW YORK.

PACKlNGmG/SKET.

SPECIFICATION forming part of Letters Patent No. 669,047, dated February 26, 1901.

Application filed October 3, 1900. Serial No. 31,919. (No model.)

To @ZZ whom t may concern: the projecting end of the dowel and brought Be it known that I, ALBERT B. PRATT, of to abut squarely against the opposing end d, Boston, in the county of Suffolk and State of as shown in Figs. 8 and 5. The gasket is now Massachusetts,have invented anew and usepractically complete and only needs to be 5 ful Improvement in Packing-Gaskets, which bent to the form necessary to fit the part or improvement is fully set forth in the followplace for which it is intended in any given ing specification and shown in the accomcase. In shaping the gasket in any case it is4 panying drawings. preferably so bent that the transverse joint My invention is an improved flexible ina shall be at oneof the flat sides of the gasket 6o 1o elastic packing-gasket and the process or if it have a form having dat sides. On acmethod of forming it, the same being herein count of the exibility of the parts the gasket after fully described, and more particularly may be readily bent to any form, the inelastic pointed out in the claims. leaden member causing it to keep the form Referring to the drawings, Figure l shows given it, the yielding dowel also partaking of x5 a sheet of packing material, partly broken the curved form of the gasket.

away, ready to be rolled in forming a gasket. In constructing this gasket it is purposely Fig. 2 is a transverse section taken on the made so that there shall be substantially an dotted line 2 2 in Fig. l. Fig. 3 shows the equal number of thicknesses or plies of the gasket completed. Fig. Ll, drawn to a large india-rubber within and without the lead 7o zo scale, is a transverse section of the gasket on sheet-that is to say, so the metal sheet shall the dotted line 4 4 in Figs. 3 and 5. Fig. 5 be at about the middle of the mass between shows portions of the joined ends of the gasits convex and concave surfaces. This will ket, parts being longitudinally sectioned on be readily understood by viewing Fig. 4E. the dotted line 5 5 in Fig. e. There are practically the same number of 75 25 A in the drawings is a sheet of packing mathicknesses of india-rubber within the coiled terialof common kind-am for example, made metal sheet B as without it, with one ply be up of layers of india-rubber and cloth altertween the coils of the metal. To produce this nated. result, the lead strip is originally placed upon B is a strip of flexible inelastic material, as the india-rubber sheet A, nearer the edge ol' 8o 3o sheetlead, having its two parallel sides ff the latter iirst rolled, as shown in Fig. l and beveled to thin edges, as shown. This strip above stated. is placed longitudinally of the sheet A and at The adhesive substance applied to the inone side of the middle thereof or nearer to dia-rubber sheet may be only for temporary one edge of the sheet, as shown. use, to hold the parts together while being 55 C is a mandrel around which to roll the rolled,andthe whole body vulcanized,iffound sheets A and B together into the form of a desirable for any particular use. tube. Previous to rolling, the surface of the Vhat I claim as my invention is.- sheet A is covered with an adhesive subl. The process of constructing packingstance, except where iu contact with the mangaskets, consisting in placing upon a sheet of 4o drel, which serves to hold the metal strip B packing material covered with an adhesive in place and to cement the involute layers substance a narrower sheet of metal and rollinto a compact tubular mass when rolled. ing the two around a mandrel to the form of The roll or tubular body is primarily straight, a tube, withdrawing the mandrel and insertand the mandrel is withdrawn after the tube ing a flexible dowel in one end of the tube so 45 is complete, leaving a central hollow or openas to project therefrom, and bringing the two ing I), Fig. 5. A short shaft c, Figs. 4 and 5, ends of the tube together, and inserting the of yielding material, as lead, in the nature of projecting end of the yielding dowel into the a dowel, is inserted in one end d of the roll adjacent end of the tube whereby the flexiand secured in place, projecting therefrom, bility of the dowel keeps the ring in shape, loo 5o as shown. The tube is then bent toa circular substantially as described.

or oval form and the empty end c passed over 2. The herein described process of constructing packing-gaskets, consisting in placsheet of packing material said metal strip being upon a sheet of packing material covered ing disposed near one end of the said sheet with an adhesive substance, a narrow sheet l the whole being rolled into compact tubular of soft metal with beveled edges, winding the form and compressed, substantially as specitwo upon a mandrel, so that the edges of the fied. metal overlap, compressing them and then In witness whereof I have hereunto set my withdrawing the mandrel, substantially as hand this 26th day of September, 1900, in the specified. I presence of two subscribing witnesses.

3. A tubular packing-gasket composed of ALBERT B. PRATT.

a rolled sheet of packing material coated with Witnesses: an adhesive substance, and a narrow strip of E. B. WHITMORE, metal With beveled edges placed upon said M. SMITH. 

